Which biblical book contains the main account of Noah’s ark?

Genesis contains the main account of Noah’s ark. Chapters 6 through 9 describe the corruption of the world, God’s instructions for building the ark, the flood, the animals and family aboard, the waters’ retreat, and the covenant afterward.

The story begins with Noah’s introduction in the genealogical material of Genesis. It then gives the ark’s dimensions and construction instructions before narrating the flood and Noah’s eventual departure. The account concludes with the covenant sign and events in Noah’s later life.

Noah is also mentioned elsewhere in the Bible, including prophetic books and the New Testament. Those later references assume or summarize aspects of the Genesis narrative, but Genesis is the foundational biblical source for the ark story.

The flood narrative is often discussed together with ancient Near Eastern flood traditions, especially the Epic of Gilgamesh and the Atrahasis tradition. Similarities include a chosen survivor, a large vessel, animals, and a devastating flood, while the stories differ in theology and detail.